Evaluating the Screening Version of the Hare Psychopathy Checklist—Revised (PCL:SV): An item response theory analysis.

The Screening Version of the Psychopathy Checklist-Revised (PCL:SV; S. D. Hart, D. N. Cox, & R. D. Hare, 1995) was developed to complement the Psychopathy Checklist-Revised (PCL-R; R. D. Hare, 1991), and for use outside forensic settings. The PCL:SV takes less time to administer and requires less collateral information than the PCL-R. An item response theory approach was adopted to determine similarities in the structural properties of the 2 instruments and whether the PCL:SV could be regarded as a short form of the PCL-R. Eight of the 12 items in the PCL:SV were strongly parallel to their equivalent PCL-R items. Of the 4 items PCL:SV items which differed from their equivalent PCL-R items, all 4 were found to be equal or superior to their equivalent PCL-R items in terms of discrimination. The analyses confirmed previous results that the interpersonal and affective features of psychopathy have higher thresholds than do the impulsive and antisocial behavioral features; individuals have to be at a higher level of the psychopathic trait before the interpersonal and affective features become evident. The PCL:SV is an effective short form of the PCL-R.